All,
In response to a private email I thought I would communicate to the mailing-list our current point of view on XUpdate support in Presentation Server:
Efforts around XUpdate do seem to be stalled. XML databases now tend to bid on proprietary extensions to XQuery (e.g. see what Tamino does, and there are talks about implementing something similar in the open source eXist database). In the future, XQuery will support standard update features, but that is probably years away.
For use as a general-purpose XML update language, we now recommend using XSLT instead. We do recognize that XUpdate has definite advantages over XSLT in certain use cases (which is why we implemented it in the first place), but it seems that the market is currently not supporting what is considered "yet another XML transformation language".
In Orbeon Presentation Server, we encourage users to use the XSLT processor for general-purpose document tranformations, either XSLT 1.0 or XSLT 2.0 (12 November 2003 Draft as implemented by Saxon) instead of using the XUpdate processor. The only place where XUpdate is not deprecated is within Page Flow, but only a subset of XUpdate is required and you can simply consider that it is part of the Page Flow syntax.
This being said, our XUpdate implementation is functional and of course you are free to use it or even contribute to it, as it is available under the LGPL license.
-Erik
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